LayoutEventHandler (Delegado)
Actualización: noviembre 2007
Espacio de nombres: System.Windows.FormsEnsamblado: System.Windows.Forms (en System.Windows.Forms.dll)
/** @delegate */ public delegate void LayoutEventHandler( Object sender, LayoutEventArgs e )
Parámetros
- sender
- Tipo: System.Object
Origen del evento.
- e
- Tipo: System.Windows.Forms.LayoutEventArgs
LayoutEventArgs que contiene los datos del evento.
Cuando se crea un delegado de LayoutEventArgs, se identifica el método que controlará el evento. Para asociar el evento al controlador de eventos, se debe agregar una instancia del delegado al evento. Se llama al controlador de eventos siempre que se produce el evento, a menos que se quite el delegado. Para obtener más información sobre los delegados del controlador de eventos, vea Eventos y delegados.
public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.Label label1; private System.Windows.Forms.Button layoutButton; private System.ComponentModel.Container components = null; public Form1() { InitializeComponent(); } protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } private void InitializeComponent() { this.layoutButton = new System.Windows.Forms.Button(); this.textBox1 = new System.Windows.Forms.TextBox(); this.label1 = new System.Windows.Forms.Label(); this.SuspendLayout(); // // layoutButton // this.layoutButton.Anchor = System.Windows.Forms.AnchorStyles.Bottom; this.layoutButton.Location = new System.Drawing.Point(72, 88); this.layoutButton.Name = "layoutButton"; this.layoutButton.Size = new System.Drawing.Size(150, 23); this.layoutButton.TabIndex = 0; this.layoutButton.Text = "Hello"; // // textBox1 // this.textBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) | System.Windows.Forms.AnchorStyles.Right); this.textBox1.Location = new System.Drawing.Point(24, 40); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(248, 20); this.textBox1.TabIndex = 1; this.textBox1.Text = "Hello"; this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged); // // label1 // this.label1.Location = new System.Drawing.Point(24, 16); this.label1.Name = "label1"; this.label1.TabIndex = 2; this.label1.Text = "Button\'s Text:"; // // Form1 // this.ClientSize = new System.Drawing.Size(292, 129); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.label1, this.textBox1, this.layoutButton}); this.Name = "Form1"; this.Text = "Layout Sample"; this.Layout += new System.Windows.Forms.LayoutEventHandler(this.Form1_Layout); this.ResumeLayout(false); } [STAThread] static void Main() { Application.Run(new Form1()); } // This method ensures that the form's width is the preferred size of 300 pixels // or the size of the button plus 50 pixels, whichever amount is less. private void Form1_Layout(object sender, System.Windows.Forms.LayoutEventArgs e) { // This event is raised once at startup with the AffectedControl // and AffectedProperty properties on the LayoutEventArgs as null. // The event provides size preferences for that case. if ((e.AffectedControl != null) && (e.AffectedProperty != null)) { // Ensure that the affected property is the Bounds property // of the form. if (e.AffectedProperty.ToString() == "Bounds") { // If layoutButton's width plus a padding of 50 pixels is greater than the preferred // size of 300 pixels, increase the form's width. if ((this.layoutButton.Width + 50) > 300) { this.Width = this.layoutButton.Width + 50; } // If not, keep the form's width at 300 pixels. else { this.Width = 300; } // Center layoutButton on the form. this.layoutButton.Left = (this.ClientSize.Width - this.layoutButton.Width) / 2; } } } // This method sets the Text property of layoutButton to the Text property // of textBox1. If the new text plus a padding of 20 pixels is larger than // the preferred size of 150 pixels, increase layoutButton's Width property. private void textBox1_TextChanged(object sender, System.EventArgs e) { // Set the Text property of layoutButton. this.layoutButton.Text = this.textBox1.Text; // Get the width of the text using the proper font. int textWidth = (int)this.CreateGraphics().MeasureString(layoutButton.Text, layoutButton.Font).Width; // If the width of the text plus a padding of 20 pixels is greater than the preferred size of // 150 pixels, increase layoutButton's width. if ((textWidth + 20) > 150) { // Setting the size property on any control raises // the Layout event for its container. this.layoutButton.Width = textWidth + 20; } // If not, keep layoutButton's width at 150 pixels. else { this.layoutButton.Width = 150; } } }
public class Form1 extends System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button layoutButton;
private System.ComponentModel.Container components = null;
public Form1()
{
InitializeComponent();
} //Form1
protected void Dispose(boolean disposing)
{
if (disposing) {
if (components != null) {
components.Dispose();
}
}
super.Dispose(disposing);
} //Dispose
private void InitializeComponent()
{
this.layoutButton = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// layoutButton
//
this.layoutButton.set_Anchor(System.Windows.Forms.AnchorStyles.Bottom);
this.layoutButton.set_Location(new System.Drawing.Point(72, 88));
this.layoutButton.set_Name("layoutButton");
this.layoutButton.set_Size(new System.Drawing.Size(150, 23));
this.layoutButton.set_TabIndex(0);
this.layoutButton.set_Text("Hello");
//
// textBox1
//
this.textBox1.set_Anchor(System.Windows.Forms.AnchorStyles.Top
| System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.
AnchorStyles.Right);
this.textBox1.set_Location(new System.Drawing.Point(24, 40));
this.textBox1.set_Name("textBox1");
this.textBox1.set_Size(new System.Drawing.Size(248, 20));
this.textBox1.set_TabIndex(1);
this.textBox1.set_Text("Hello");
this.textBox1.add_TextChanged(new System.EventHandler(this.
textBox1_TextChanged));
//
// label1
//
this.label1.set_Location(new System.Drawing.Point(24, 16));
this.label1.set_Name("label1");
this.label1.set_TabIndex(2);
this.label1.set_Text("Button\'s Text:");
//
// Form1
//
this.set_ClientSize(new System.Drawing.Size(292, 129));
this.get_Controls().AddRange(new System.Windows.Forms.Control[] { this.
label1, this.textBox1, this.layoutButton });
this.set_Name("Form1");
this.set_Text("Layout Sample");
this.add_Layout(new System.Windows.Forms.LayoutEventHandler(this.
Form1_Layout));
this.ResumeLayout(false);
} //InitializeComponent
/** @attribute STAThread()
*/
public static void main(String[] args)
{
Application.Run(new Form1());
} //main
// This method ensures that the form's width is the preferred size of 300 pixels
// or the size of the button plus 50 pixels, whichever amount is less.
private void Form1_Layout(Object sender,
System.Windows.Forms.LayoutEventArgs e)
{
// This event is raised once at startup with the AffectedControl
// and AffectedProperty properties on the LayoutEventArgs as null.
// The event provides size preferences for that case.
if (e.get_AffectedControl() != null
&& e.get_AffectedProperty() != null) {
// Ensure that the affected property is the Bounds property
// of the form.
if ((e.get_AffectedProperty().ToString()).Equals("Bounds")) {
// If layoutButton's width plus a padding of 50 pixels is greater
// than the preferred size of 300 pixels, increase the form's width.
if (this.layoutButton.get_Width() + 50 > 300) {
this.set_Width(this.layoutButton.get_Width() + 50);
}
// If not, keep the form's width at 300 pixels.
else {
this.set_Width(300);
}
// Center layoutButton on the form.
this.layoutButton.set_Left((this.get_ClientSize().get_Width()
- this.layoutButton.get_Width()) / 2);
}
}
} //Form1_Layout
// This method sets the Text property of layoutButton to the Text property
// of textBox1. If the new text plus a padding of 20 pixels is larger than
// the preferred size of 150 pixels, increase layoutButton's Width property.
private void textBox1_TextChanged(Object sender, System.EventArgs e)
{
// Set the Text property of layoutButton.
this.layoutButton.set_Text(this.textBox1.get_Text());
// Get the width of the text using the proper font.
int textWidth = (int)(this.CreateGraphics().MeasureString(layoutButton.
get_Text(), layoutButton.get_Font()).get_Width());
// If the width of the text plus a padding of 20 pixels is greater than the preferred size of
// 150 pixels, increase layoutButton's width.
if (textWidth + 20 > 150){
// Setting the size property on any control raises
// the Layout event for its container.
this.layoutButton.set_Width(textWidth + 20);
}
// If not, keep layoutButton's width at 150 pixels.
else{
this.layoutButton.set_Width(150);
}
} //textBox1_TextChanged
} //Form1
Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
.NET Framework y .NET Compact Framework no admiten todas las versiones de cada plataforma. Para obtener una lista de las versiones compatibles, vea Requisitos de sistema de .NET Framework.
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